OP 18 July, 2024 - 01:00 PM
(This post was last modified: 18 July, 2024 - 01:01 PM by seaboy. Edited 1 time in total.)
Nmap stands for Network Mapper which is a free Open source command-line tool. Nmap is an information-gathering tool used for recon reconnaissance. Basically, it scans hosts and services on a computer network which means that it sends packets and analyzes the response.
Code:
Switch Example Description
nmap 192.168.1.1 Scan a single IP
nmap 192.168.1.1 192.168.2.1 Scan specific IPs
nmap 192.168.1.1-254 Scan a range
nmap scanme.nmap.org Scan a domain
nmap 192.168.1.0/24 Scan using CIDR notation
-iL nmap -iL targets.txt Scan targets from a file
-iR nmap -iR 100 Scan 100 random hosts
--exclude nmap --exclude 192.168.1.1 Exclude listed hosts
Scan Techniques
Switch Example Description
-sS nmap 192.168.1.1 -sS TCP SYN port scan (Default)
-sT nmap 192.168.1.1 -sT TCP connect port scan
(Default without root privilege)
-sU nmap 192.168.1.1 -sU UDP port scan
-sA nmap 192.168.1.1 -sA TCP ACK port scan
-sW nmap 192.168.1.1 -sW TCP Window port scan
-sM nmap 192.168.1.1 -sM TCP Maimon port scan
Host Discovery
Switch Example Description
-sL nmap 192.168.1.1-3 -sL No Scan. List targets only
-sn nmap 192.168.1.1/24 -sn Disable port scanning. Host discovery only.
-Pn nmap 192.168.1.1-5 -Pn Disable host discovery. Port scan only.
-PA nmap 192.168.1.1-5 -PA22-25,80 TCP ACK discovery on port x.
Port 80 by default
-PU nmap 192.168.1.1-5 -PU53 UDP discovery on port x. Port 40125 by default
-PR nmap 192.168.1.1-1/24 -PR ARP discovery on local network
-n nmap 192.168.1.1 -n Never do DNS resolution
Port Specification
Switch Example Description
-p nmap 192.168.1.1 -p 21 Port scan for port x
-p nmap 192.168.1.1 -p 21-100 Port range
-p nmap 192.168.1.1 -p U:53,T:21-25,80 Port scan multiple TCP and UDP ports
-p- nmap 192.168.1.1 -p- Port scan all ports
-p nmap 192.168.1.1 -p http,https Port scan from service name
-F nmap 192.168.1.1 -F Fast port scan (100 ports)
--top-ports nmap 192.168.1.1 --top-ports 2000 Port scan the top x ports
-p-65535 nmap 192.168.1.1 -p-65535 Leaving off initial port in range
makes the scan start at port 1
-p0- nmap 192.168.1.1 -p0- Leaving off end port in range makes the scan go through to port 65535
Service and Version Detection
Switch Example Description
-sV nmap 192.168.1.1 -sV Attempts to determine the version of the service running on port
-sV --version-intensity nmap 192.168.1.1 -sV --version-intensity 8 Intensity level 0 to 9. Higher number increases possibility of correctness
-sV --version-light nmap 192.168.1.1 -sV --version-light Enable light mode. Lower possibility of correctness. Faster
-sV --version-all nmap 192.168.1.1 -sV --version-all Enable intensity level 9. Higher possibility of correctness. Slower
-A nmap 192.168.1.1 -A Enables OS detection, version detection, script scanning, and traceroute
OS Detection
Switch Example Description
-O nmap 192.168.1.1 -O Remote OS detection using TCP/IP
stack fingerprinting
-O --osscan-limit nmap 192.168.1.1 -O --osscan-limit If at least one open and one closed
TCP port are not found it will not try
OS detection against host
-O --osscan-guess nmap 192.168.1.1 -O --osscan-guess Makes Nmap guess more aggressively
-O --max-os-tries nmap 192.168.1.1 -O --max-os-tries 1 Set the maximum number x of OS
detection tries against a target
-A nmap 192.168.1.1 -A Enables OS detection, version detection, script scanning, and traceroute
Timing and Performance
Switch Example Description
-T0 nmap 192.168.1.1 -T0 Paranoid (0) Intrusion Detection
System evasion
-T1 nmap 192.168.1.1 -T1 Sneaky (1) Intrusion Detection System
evasion
-T2 nmap 192.168.1.1 -T2 Polite (2) slows down the scan to use
less bandwidth and use less target
machine resources
-T3 nmap 192.168.1.1 -T3 Normal (3) which is default speed
-T4 nmap 192.168.1.1 -T4 Aggressive (4) speeds scans; assumes
you are on a reasonably fast and
reliable network
-T5 nmap 192.168.1.1 -T5 Insane (5) speeds scan; assumes you
are on an extraordinarily fast network
Switch Example input Description
--host-timeout <time> 1s; 4m; 2h Give up on target after this long
--min-rtt-timeout/max-rtt-timeout/initial-rtt-timeout <time> 1s; 4m; 2h Specifies probe round trip time
--min-hostgroup/max-hostgroup <size<size> 50; 1024 Parallel host scan group
sizes
--min-parallelism/max-parallelism <numprobes> 10; 1 Probe parallelization
--scan-delay/--max-scan-delay <time> 20ms; 2s; 4m; 5h Adjust delay between probes
--max-retries <tries> 3 Specify the maximum number
of port scan probe retransmissions
--min-rate <number> 100 Send packets no slower than <numberr> per second
--max-rate <number> 100 Send packets no faster than <number> per second
NSE Scripts
Switch Example Description
-sC nmap 192.168.1.1 -sC Scan with default NSE scripts. Considered useful for discovery and safe
--script default nmap 192.168.1.1 --script default Scan with default NSE scripts. Considered useful for discovery and safe
--script nmap 192.168.1.1 --script=banner Scan with a single script. Example banner
--script nmap 192.168.1.1 --script=http* Scan with a wildcard. Example http
--script nmap 192.168.1.1 --script=http,banner Scan with two scripts. Example http and banner
--script nmap 192.168.1.1 --script "not intrusive" Scan default, but remove intrusive scripts
--script-args nmap --script snmp-sysdescr --script-args snmpcommunity=admin 192.168.1.1 NSE script with arguments
Useful NSE Script Examples
Command Description
nmap -Pn --script=http-sitemap-generator scanme.nmap.org http site map generator
nmap -n -Pn -p 80 --open -sV -vvv --script banner,http-title -iR 1000 Fast search for random web servers
nmap -Pn --script=dns-brute domain.com Brute forces DNS hostnames guessing subdomains
nmap -n -Pn -vv -O -sV --script smb-enum*,smb-ls,smb-mbenum,smb-os-discovery,smb-s*,smb-vuln*,smbv2* -vv 192.168.1.1 Safe SMB scripts to run
nmap --script whois* domain.com Whois query
nmap -p80 --script http-unsafe-output-escaping scanme.nmap.org Detect cross site scripting vulnerabilities
nmap -p80 --script http-sql-injection scanme.nmap.org Check for SQL injections
Firewall / IDS Evasion and Spoofing
Switch Example Description
-f nmap 192.168.1.1 -f Requested scan (including ping scans) use tiny fragmented IP packets. Harder for packet filters
--mtu nmap 192.168.1.1 --mtu 32 Set your own offset size
-D nmap -D 192.168.1.101,192.168.1.102,
192.168.1.103,192.168.1.23 192.168.1.1
Send scans from spoofed IPs
-D nmap -D decoy-ip1,decoy-ip2,your-own-ip,decoy-ip3,decoy-ip4 remote-host-ip Above example explained
-S nmap -S www.microsoft.com www.facebook.com Scan Facebook from Microsoft (-e eth0 -Pn may be required)
-g nmap -g 53 192.168.1.1 Use given source port number
--proxies nmap --proxies http://192.168.1.1:8080, http://192.168.1.2:8080 192.168.1.1 Relay connections through HTTP/SOCKS4 proxies
--data-length nmap --data-length 200 192.168.1.1 Appends random data to sent packets
Example IDS Evasion command
nmap -f -t 0 -n -Pn –data-length 200 -D 192.168.1.101,192.168.1.102,192.168.1.103,192.168.1.23 192.168.1.1
Output
Switch Example Description
-oN nmap 192.168.1.1 -oN normal.file Normal output to the file normal.file
-oX nmap 192.168.1.1 -oX xml.file XML output to the file xml.file
-oG nmap 192.168.1.1 -oG grep.file Grepable output to the file grep.file
-oA nmap 192.168.1.1 -oA results Output in the three major formats at once
-oG - nmap 192.168.1.1 -oG - Grepable output to screen. -oN -, -oX - also usable
--append-output nmap 192.168.1.1 -oN file.file --append-output Append a scan to a previous scan file
-v nmap 192.168.1.1 -v Increase the verbosity level (use -vv or more for greater effect)
-d nmap 192.168.1.1 -d Increase debugging level (use -dd or more for greater effect)
--reason nmap 192.168.1.1 --reason Display the reason a port is in a particular state, same output as -vv
--open nmap 192.168.1.1 --open Only show open (or possibly open) ports
--packet-trace nmap 192.168.1.1 -T4 --packet-trace Show all packets sent and received
--iflist nmap --iflist Shows the host interfaces and routes
--resume nmap --resume results.file Resume a scan
Helpful Nmap Output examples
Command Description
nmap -p80 -sV -oG - --open 192.168.1.1/24 grep open
nmap -iR 10 -n -oX out.xml grep "Nmap"
nmap -iR 10 -n -oX out2.xml grep "Nmap"
ndiff scanl.xml scan2.xml Compare output from nmap using the ndif
xsltproc nmap.xml -o nmap.html Convert nmap xml files to html files
grep " open " results.nmap sed -r 's/ +/ /g'
Miscellaneous Options
Switch Example Description
-6 nmap -6 2607:f0d0:1002:51::4 Enable IPv6 scanning
-h nmap -h nmap help screen
Other Useful Nmap Commands
Command Description
nmap -iR 10 -PS22-25,80,113,1050,35000 -v -sn Discovery only on ports x, no port scan
nmap 192.168.1.1-1/24 -PR -sn -vv Arp discovery only on local network, no port scan
nmap -iR 10 -sn -traceroute Traceroute to random targets, no port scan
nmap 192.168.1.1-50 -sL --dns-server 192.168.1.1 Query the Internal DNS for hosts, list targets onlyHope the article is useful for you, have fun.
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Like is Appreciated